Determination of the location of the fovea on the fundus
Determination of the location of the fovea on the fundus
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DOI：
10.1167/iovs.03-1157
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发表时间：
2004-09-01
影响因子：
4.4
通讯作者：
Rohrschneider, K
中科院分区：
文献类型：
--
作者：
Rohrschneider, K
目的.目的探讨激光扫描检眼镜测量正常眼视神经乳头与黄斑中心凹之间的距离是否有助于黄斑病变患者黄斑中心凹相对于视盘的定位。测量104例健康先证者104只眼视乳头中心与中央凹之间水平和垂直方向的角距离。为了进一步评估这些人中70人的个体内变化，还测量了对侧眼睛。视盘与中央凹之间的距离垂直差异大于水平差异（-1.5 +/-0.9度[-3.65至-0.65度] vs. 15.5 +/-1.1度[13.0 - 17.9度]）。中心凹与视盘中心之间的平均角度为-5.6 ± 3.3 °。左右眼的个体内差异明显较低，平均垂直角为0.2 ± 1.3 °，水平角为0.0 ± 1.1 °。视神经乳头和中央凹之间的距离不允许有意义地确定发生形态变化的眼睛中中央凹的位置。中心凹相对于视神经乳头中心的旋转角度相对稳定。因此，中心暗点的大小可以通过根据优选视网膜轨迹（PRL）的变化的盲点的移动来确定。此外，对中央凹位置的了解使得能够确定同一患者的对侧眼睛中的位置。
PURPOSE. To evaluate whether the distance between optic nerve head and fovea in healthy eyes determined by scanning laser ophthalmoscope may facilitate estimation of the location of the fovea relative to the optic disc in patients with macular disease.METHODS. The angular distance was measured, in horizontal and vertical directions, between the center of the optic nerve head and the fovea in 104 eyes of 104 healthy probands. For additional evaluation of intraindividual variation in 70 of these persons the contralateral eye was measured as well.RESULTS. The distance between the optic disc and the fovea differed vertically more than horizontally ( - 1.5 +/- 0.9degrees [ - 3.65 to -0.65degrees] vs. 15.5 +/- 1.1degrees [13.0 - 17.9degrees]). There was a mean angle between the fovea and the center of the optic disc versus the horizon of - 5.6 +/- 3.3degrees. The intraindividual difference between right and left eyes was markedly lower, with average angles being 0.2 +/- 1.3degrees vertically and 0.0 +/- 1.1degrees horizontally.CONCLUSIONS. The distance between the optic nerve head and the fovea does not allow for a meaningful determination of the location of the fovea in eyes in which morphologic changes have occurred. The angle of rotation of the fovea relatively to the center of the optic nerve head is relatively stable. Therefore, the size of a central scotoma can be determined by movement of the blind spot according to the change of the preferred retinal locus (PRL). In addition, the knowledge of the location of the fovea enables determination of the position in the contralateral eye of the same patient.